NOISE, VIBRATION, AND SEISMIC CONTROL SECTION · PDF fileNOISE, VIBRATION, AND SEISMIC CONTROL 15200 NOISE, VIBRATION, AND SEISMIC CONTROL SECTION 15200 . PART 1 ... sound pressure

JAPANESE SCHOOLHOUSE BID AND PERMIT SET MAY 9, 2008

CAREY & CO., INC. NOISE, VIBRATION, AND SEISMIC CONTROL 15200

NOISE, VIBRATION, AND SEISMIC CONTROL

SECTION 15200

PART 1 GENERAL

1.1 DESCRIPTION

A. Provide complete systems including design, materials, equipment and installation for vibration isolation and seismic restraints for equipment, piping and ductwork.

B. The work of this Section includes, but is not limited to:

1. Seismic Restraints

2. Vibration Isolators

3. Flexible Pipe Connections

4. Field Dynamic Balancing

1.2 WORK INCLUDED

A. Objective: It is the objective of this specification to provide the necessary design for the avoidance of excessive noise or vibration in the building due to the operation of machinery or equipment, and/or due to interconnected piping, ductwork or conduit.

B. Description of Work: Furnish, install, assemble, set up, test (hereinafter "provide") the following systems and equipment in accordance with the Contract Documents.

1. Isolation of mechanical equipment including but not limited to fans, package air conditioning units, refrigeration compressors, cooling towers, evaporative condensers and pumps, including bases.

2. Isolation for ductwork and piping (including but not limited to domestic hot and cold water, waste, soil, vent and including all piping connected to vibrating equipment).

3. Inspection of installation of vibration isolation to equipment.

4. Provision of all Motion Restraints required by applicable codes for noise and vibration control equipment/systems specified herein.



5. Coordination of Airtight Installation requirements at Mechanical Rooms and/or Drywall Duct Enclosures.

6. Dynamic balancing of equipment.

1.3 RELATED WORK SPECIFIED ELSEWHERE

A. Concrete, Division 3

B. Thermal and Moisture Protection, Division 7

C. Finishes, Division 9

D. Section 15090, Support and Anchors

E. Electrical, Division 16

1.4 QUALITY ASSURANCE

A. General:

1. Anchor, support, and brace all equipment and systems to resist seismic forces as specified hereinafter.

2. Comply with CCR 2001 California Building Code.

3. Where anchorage support and bracing for various manufactured and fabricated items and systems are detailed and scheduled on the drawings, provide as shown.

4. For anchorage, support and bracing not detailed, provide in accordance with OSHPD Certified systems or submit details of anchors, supports and bracings complete with calculations. Details and calculation shall be signed and stamped by a Structural Engineer licensed in the state having jurisdiction over the project.

B. Reference Standards:

1. Standards: Provide equipment in accordance with the latest edition and revisions of all applicable standards and specifications of all appropriate agencies including, but not limited to, the following:

a. ARI - Air Conditioning and Refrigeration Institute



1) ARI 260 - 2001 Standard for Sound Rating of Ducted Air Moving and Conditioning Equipment.

2) ARI 270 - 1995 Standard for Sound Rating of Outdoor Unitary Equipment.

3) ARI 275 - 1997 Standard for Application of Sound Rating Levels of Outdoor Unitary Equipment.

4) ARI 280 - 1995 Standard for Requirements for the Qualification of Reverberant Rooms in the 63 Hz Octave Band.

5) ARI 300 - 2000 Standard for Sound Rating and Sound Transmission Loss of Packaged Terminal Equipment.

6) ARI 350 - 2000 Standard for Sound Rating of Non-Ducted Indoor Air-conditioning Equipment.

7) ARI 370 - 2001 Standard for Sound Rating of Large Outdoor Refrigerating and Air-conditioning Equipment.

8) ARI 530 - 1995 Standard for Method of Rating Sound and Vibration of Refrigerant Compressors.

9) ARI 575 - 1994 Standard for Method of Measuring Machinery Sound Within an Equipment Space.

10) ARI 885 - 1998 Standard for Procedure for Estimating Occupied Space Sound Levels in the Application of Air Terminals and Air Outlets.

b. ASTM - American Society for Testing and Materials

1) Specification A123/A123M-01a Standard Specification for Zinc (Hot-Dip Galvanized) Coatings on Iron and Steel Products.

2) Test Method ASTM D471-98e1 Standard Test Method for Rubber Property-Effect of Liquids.

3) Test Method ASTM D2240-02 - Standard Test Method for Rubber Property- Durometer Hardness.

4) Test Method ASTM E84-01 - Surface Burning Characteristics of Building Materials.

c. ASA - Acoustical Society of America/ANSI

1) ANSI S12.2-1995 (R1999) American National Standard Criteria for Evaluating Room Noise

2) ANSI S12.11-1987 (R1997) American National Standard Method for the Measurement of Noise Emitted by Small Air-Moving Devices

3) ANSI S12.18-1994 (R1999) American National Standard Procedures for Outdoor Measurement of Sound Pressure Level



4) ANSI S12.30-1990 (R1997) American National Standard Guidelines for the Use of Sound Power Standards and for the Preparation of Noise Test Codes

5) ANSI S12.31-1990 (R2001) American National Standard Precision Methods for the Determination of Sound Power Levels of Broad-Band Noise Sources in Reverberation Rooms

6) ANSI S12.36-1990 (R1997) American National Standard Survey Methods for the Determination of Sound Power Levels of Noise Sources

7) ANSI S12.54-1999 ISO 3744:1994 NAIS Standard Acoustics - Determination of sound power levels of noise sources using sound pressure - Engineering method in an essentially free field over a reflecting plane

d. AMCA - Air Movement and Control Association International, Inc.

1) AMCA Standard 300-96, Reverberant Room Method for Sound Testing of Fans

2) AMCA Standard 320-98, Laboratory Methods of Sound Testing Fans Using Sound Intensity

3) ANSI/AMCA Standard 330-97 (ANSI/ASHRAE 68-99), Laboratory Method of Testing to Determine the Sound Power in a Duct

e. AWS - American Welding Society, Inc.

1) AWS D1.1 - 2002 Structural Welding Code - Steel

f. ASHRAE - American Society of Heating, Refrigeration and Air Conditioning Engineers

1) 1999 HVAC Applications Manual, Chapter 46

g. SMACNA - Sheet Metal & Air Conditioning Contractor's National Association, Inc.

1) Rectangular Industrial Duct Construction Standards 1st edition, 1980

2) Round Industrial Duct Construction Standards, 1st edition, 1980 3) HVAC Duct Construction Standards - Metal & Flexible, 2nd

edition, 1995 4) Architectural Sheet Metal Manual, 5th edition, 1993



C. Codes: Perform installation in accordance with all applicable international, federal, state, county, municipal and local codes and regulations.

D. Conflicts: Present any conflicts between codes, regulations, specifications and/or requirements at least thirty (30) days prior to the commencement of the scheduled work.

E. Schedules: See contents of this Section for specific specifications and schedules of vibration isolators, frames and static deflections. Also see equipment support schedule on the drawings.

F. Product Suppliers: All vibration isolation devices, equipment bases and frames for equipment and piping furnished under this Division shall be designed and furnished by no more than two different isolator manufacturers and no single vibrating element shall be isolated by the products of more than one isolator manufacturer.

G. Supervision: The installation of all vibration isolation units, and associated hangers and bases shall be under the direct supervision of the vibration isolation manufacturer's representative.

1.5 COORDINATION

A. Coordinate with all trades and Electrical Division for installation of Vibration Isolation. Coordinate with Concrete trade for equipment inertia bases. Coordinate Work of this Section with all other impacted trades.

1.6 SUBMITTALS

A. Descriptive Data - Submit the following:

1. Catalog cuts and data sheets on specific vibration isolators to be utilized showing compliance with the specifications and schedules herein. Include load versus deflection curves.

2. An itemized list showing the items of equipment, piping, etc., to be isolated, the isolator type and model number selected, isolator loading and deflection, wire diameter and number of coils in springs, and references to specific shop drawings showing frame construction where specified.

3. Written approval of the frame design to be used, obtained from the equipment manufacturer.



B. Seismic Bracing

1. Where pre-approved bracing systems will be employed, submittals shall include:

a. Approval identification number. b. System component brochure describing components used and detailed

installation instruction. c. Loads to be transmitted to structure at anchor point.

2. Where anchorage, support and bracing are not detailed on the drawings and pre-approved systems are not used, Contractor shall submit designs and calculations of proposed systems. Submittals shall include:

a. Detailed sketches showing system to be installed, stamped and signed by a California registered Structural Engineer.

b. Written instructions from the vibration isolation manufacturer as to the proper installation and adjustment of vibration isolation devices, including hangers and bases; alternatively the equipment may be installed by the vibration isolation manufacturer.

c. For each Motion Restraint, a stress analysis prepared by a Structural Engineer licensed to practice in the state of Project jurisdiction.

1) Provide sufficient detail to permit architect and authorities having jurisdiction to verify compliance with all applicable Codes and these specifications.

2) For vibration isolation used with floor of roof mounted equipment over 400 pounds or suspended equipment over 20 pounds, provide calculations for:

a) shear, b) pull-up, c) primary overturning and d) secondary overturning.

d. A certification in the calculation cover sheet stating:

1) "These calculations demonstrate that the system detailed complies with the requirements of Chapter of the California Building Code. The mechanical system in which this bracing will be applied is {rigid} {non-rigid} as defined in Chapter." (Choose applicable description.)



3. An itemized list of all items of equipment to be fitted with flexible piping and/or duct connections.

a. Flexible piping and/or duct submittals shall contain all information and calculations to demonstrate conformance and suitability for the equipment operating conditions including but not limited to pressure, temperature, capacity, mounting, maintenance, etc.

b. Submittals shall also include independent acoustical test data demonstrating at least 20 dB attenuation of vibration accelerations at typical blade passage frequencies.

C. Certified acoustic test data for terminal units. Provide maximum casing radiated and discharge noise PWL and SPL in accordance with the specified procedures. Provide acoustical test data for in duct insertion loss.

D. Shop Drawings - Submit the following and secure approvals prior to fabrication:

1. Drawings showing equipment frame construction for each machine, including dimensions, structural member sizes, support point locations, etc.

2. Drawings showing methods for suspensions, support, guides, etc., for piping and ductwork, etc.

3. Drawings showing methods, for isolation of ducts, pipes, etc., piercing walls, slabs, beams, etc.

4. Drawing showing methods numbers and details of Motion Restraints and anchors for equipment, frames, isolators, piping, ductwork, etc., including calculations as above.

5. Details for concrete and steel bases including anchor bolt locations.

6. Specific details of restraints including anchor bolts for mounting and maximum loading at each location, showing compliance with Code and coordination with the Project Architectural, Structural and Mechanical Documents.

7. Details of flexible piping and duct connections for all typical conditions listed in the schedule provided above.

E. Anchorages and Supports



1. Where Contractor-proposed substitutions change the weight, size, configuration or other aspects of systems and equipment that will affect the performance of anchorages and/or supports, the Contractor shall submit calculations for proposed anchors and supports, and install them as shown in these calculations. The calculations shall include the same certification and engineer's stamp as required above for seismic bracing.

2. Where contractor-proposed substitutions are claimed to have no effect on anchors and supports detailed on the Contract Documents, Contractor shall submit information on sizes, weights, center of gravity and other relevant information to demonstrate this fact.

3. Contractor shall submit details and calculations for all embedded inserts, drilled inserts and other fasteners for attachments of suspended components showing the load-carrying capacity of each device calculated in accordance with Chapter 16 of the California Building Code. The calculations shall include the same certification and engineer's stamp as required above for seismic bracing.

4. For all anchorages and supports not detailed on the Contract Documents, Contractor shall submit details and calculations. The calculations shall include the same certification and engineer's stamp as required above for seismic bracing.

PART 2 PRODUCTS

2.1 GENERAL PROPERTIES

A. Deflection: Vibration isolators shall have either known undeflected heights or other markings so that, after adjustment, when carrying their load, the deflection under load can be verified, thus determining that the load is within the proper range of the device and that the correct degree of vibration isolation is being provided according to the design.

B. Range: Isolators shall operate in the linear portion of their load versus deflection curve. Load versus deflection curves shall be furnished by the manufacturer and must be linear over a deflection range 60 percent above the design deflection.

C. Ratio: Ratio of lateral to vertical stiffness shall not be less than 1.0 or greater than 1.3.

D. Nested: Unless specifically noted, nested spring designs shall not be permitted.



E. Uniformity: Vertical natural frequency for each support point, based upon the load per isolator and isolator stiffness, shall not differ by more than +/- 10 percent.

F. Isolation: Wave motion through the isolator shall be reduced to the following extent: Isolation above the primary vertical system resonance frequency shall follow the theoretically predicted isolation curve for single degree of freedom systems within 10% up to 50 dB or greater at all frequencies above 150 Hz.

G. Protection: Isolators installed outdoors shall be designed for such exposure suitable to the Project conditions.

1. Springs shall be coated in neoprene or PVC. Spring housings shall be hot dip galvanized.

2. All neoprene mountings shall have a Shore-A hardness of 30 to 50, after minimum aging of 20 days or corresponding oven-aging.

H. Internal Isolation: Where vibration isolators and associated equipment frames have been specified herein for "package" air-handling units which are available with "internal" isolation; the contractor shall comply with the following:

1. Provide neoprene mounts for the "internal" isolation supplied by the air-handling unit manufacturer. Such mounts shall be of 30 to 60 durometer neoprene and shall have a static deflection no greater than 0.25 times the scheduled static deflections.

2. "Internal" isolation in lieu of the specified vibration isolators and scheduled equipment frames is unacceptable. Where internal isolation is provided, in addition to the specified isolation, same shall be removed or made ineffective.

2.2 ACCEPTABLE MANUFACTURERS

A. Pipe Bracing Systems:

1. NUSIG/Badger Industries

2. Bline

3. Super Strut

4. Or equal

B. Vibration Isolators:



1. Mason Industries

2. Peabody Kinetics

3. M.W. Sausse & Co.

4. Or equal

2.3 ISOLATOR DESCRIPTION

A. Application Cross-Reference: For application and the specific static deflection requirements of the isolators described below, refer to schedules and references elsewhere herein.

1. Type MS: Bare spring type equipped with leveling bolts and with two layers of ribbed or waffled neoprene pad separated by a 1/16" galvanized steel plate under the base plate.

2. Type MSL: Bare spring type with two layers of ribbed neoprene pad with 1/16" galvanized steel separator between layers under the base plate. Provide limit stops to prohibit spring extension if the load is removed. These stops shall serve as rigid blocking during erections so that the installed and operating heights shall be the same. Provide a maximum of 1/4" clearance around restraining bolts and between the limit stops and the housing so as not to interfere with the spring action. Limit stops shall be out of contact during normal operation.

3. Type HS: Suspension hangers having a steel frame and spring element in series with a 1 inch thick neoprene pad with integral grommet. The design static deflection under load shall be as shown on the schedule. The isolator shall be designed so hanger rod may be misaligned 15 degrees relative to the vertical without touching integral grommet inset in hanger box frame.

4. Type HD: Spring hangers, load transfer. Same as Type HS with washer and nut assembly and indicator for load transfer and deflection readout.

5. Type HN: Suspension hangers having a neoprene isolator unit having a minimum static deflection range of 0.25" to 0.5" designed to preclude contact of hanger rods with frame at up to 15 degree misalignment.

6. Type MN: Neoprene isolator unit having a minimum static deflection range of 0.25" to 0.5".



7. Type NSP: Neoprene pad. Waffled or ribbed. Typically 5/16 to 2" thick. Durometer of 50 maximum. Static deflection typically 0.05". Nominal design 40 durometer for 0.05" static deflection under 60 psi load. Provide steel load distribution plates. Size of pad to be selected by isolator supplier based on load per point.

8. Type MND: Neoprene Mount, Deep Displacement. A machinery mount with a neoprene diagonal lattice structure located between steel base and support plates. Suitable for loads from 300 to 4000 lbs and for driving frequencies as low as 6 Hz. Capable of providing static deflections from 5/8" to 1" with lateral stability.

9. Corrosion Protection: Steel parts of vibration isolators and seismic snubbers, except springs, shall be hot dipped galvanized in accordance with ASTM A123. Where steel parts are exposed to the weather, galvanized coating shall be at least 2 ounces of zinc per square foot of surface. Springs shall be neoprene coated.

2.4 EQUIPMENT FRAMES

A. General Properties: Mounting frames and/or brackets shall be provided to carry the load of the equipment without stressing or causing mechanical distortion of the equipment. Each piece of equipment shall be supported at least four points by vibration isolators and restrained at least four locations by Motion Restraint.

1. Rigid Steel (SB): Construction:

a. Rectangular with a minimum of four pieces of welded, wide flange or channel structural steel with welded height saving brackets to accept the isolators. Additional frame members shall be provided as necessary to support pumps, motors, etc.

b. The section depth of the frame members shall be greater than 1/10 of the length of the longest frame member, and shall be constant in all four perimeter frame pieces. Provide height saving brackets at all mounting locations to maintain a 1 inch clearance below the base.

2. Floating Concrete Bases (CB): Construction:

a. Provide rectangular steel concrete pouring forms for floating concrete bases, with a minimum of four pieces of welded, wide flange or channel structural steel with welded or integral height saving brackets to accept the isolators and to maintain a 1 inch clearance below the base. Additional frame members shall be provided as necessary to



support pumps, motors, etc. Forms shall include minimum concrete reinforcing consisting of 2 inch bars welded in place on 6 inch centers running both ways in a layer 1.5 inch above the bottom. Provide forms with steel templates to hold the anchor bolt sleeves and anchor bolts while concrete is being poured.

b. The section depth of the frame members shall be greater than 1/12 of the length of the longest frame member, but not less than 6", and shall be constant in all four perimeter frame pieces.

3. Integrated Roof-mounted Spring and Frame (IRSF): The integrated roof-mounted spring and frame assembly shall consist of a rectangular angle iron equipment frame supported by a type MS isolator on a steel channel roof perimeter. This assembly integrates with the roof insulation and canting to provide a weather-tight seal with cover plates removable for isolator inspection. The IRSF shall provide integral motion restraint and shall be available in stock modular construction components.

2.5 EQUIVALENT VIBRATION ISOLATORS AND EQUIPMENT FRAMES

A. Isolators

1. Acceptable subject to 2.03 above:

Type

Description M

ason Industries

Vibre

Produ

x/ Sause

Mech

anical

Kineti

cs

Am

ber B

ooth

Moun

tings &

MS

Spring Mount SLF* RMS

G* B

FDS*

SW* ADC*

MSL

Spring Mount with

imit Stop LSLR C series

RMLS-EQ

-- FLS

CT AWR

Under 1.5" S.D. and under 200 pounds load

er isol. p

SLR A series

RMUJ-EQ-

SH

B FLS

CT AWR

HS

Spring Hanger 30N* HXA

* B

SRH

*

BSRA*

SH* HD

Spring Hanger PC30N* HXA-

PC --

--

--

HN

Neoprene Hanger HD* HSS* --

RH*

HRD

* RHD*

MN

Neoprene Mount ND* DD* --

RD*

RVD

* RD*



MND

Neoprene Mount, Deep Deflection*

-- -- Lattice

Mount

-- -- --

NSP

Neoprene W,

WM* R*

NPS*

SP-NR*

Shear-flex

*Unrestrained isolation systems require separate Motion Restraint as specified below.

B. Frames and Curbs

1. Acceptable subject to 2.04 above:

Type Description M

ason Industries

Vibrex/

Sause

Kinetics

Am

ber

Vibration

Mounting

s &

Booth

Controls

SB

Rigid Steel Base MSL/WFS

L RMSB SFB

B WFB-AC

CB

Floating Concrete Base

BMK

IRSF

Integrated Roof Mount

RSC VIC-EQ

ESR

B B

2.6 MOTION RESTRAINTS

A. Objective: Provide motion restraining devices at all vibration isolated piping and equipment. Design restraints to comply with applicable Code in Project Jurisdiction.

B. General properties: Restraints shall permit adjustment during installation to insure sufficient clearance between vibration isolated element and rigid restraining device. Restraints at base supported equipment shall include resilient neoprene pads at all potential contact areas between isolated equipment and rigid restraining element.

C. Equipment, equipment bases and concrete inertia bases shall be restrained against excessive movement during a seismic event by the use of resilient snubbers designed to resist forces in accordance with Title 24 requirements. The steel members of the snubbers shall be designed to yield but not fail under these design conditions. Calculations by a Registered Professional Engineer, or certified tests reports from a nationally recognized independent test laboratory shall be submitted which verify the capacity of each snubber.



D. Restraint Description

1. Restraining devices at base supported vibration isolated equipment shall be as manufactured by Mason Industries, type Z-1011 or equal by Vibrex, Amber Booth or Kinetics.

2. Coordinate restraint bolt locations with the structural and mechanical drawings and conditions.

3. Restraints at suspended piping and equipment shall consist of stainless steel cables together with neoprene snubbers arranged to achieve the required all-directional restraint and sized to resist the forces defined. Shop Drawings shall indicate proposed method for achieving vertical restraint for ceiling suspended piping. Cables shall have sufficient slack to avoid short circuiting the vibration isolators.

4. Snubbers shall be welded steel, and shall be attached to the supporting structure in a manner consistent with anticipated loads. Such attachments shall meet current State Building Codes.

5. Snubbers shall be placed around equipment to limit lateral or vertical movement at each snubber to one-quarter inch (1/4"). A minimum of four (4) snubbers shall be installed around each piece of resiliently supported equipment.

6. Snubbers shall include resilient pads to cushion any impact, and shall be installed so as to be out of contact during equipment operation.

2.7 VIBRATION ISOLATOR APPLICATION AND SCHEDULES - EQUIPMENT

A. General: The isolator type scheduled shall be furnished and installed for the following mechanical equipment in accordance with Part 3 herein, loaded to yield the specified deflection per the schedule below at each isolator. The contractor shall verify that the dead load deflection of the structure at each isolator location is less than 0.25 times the isolator static deflections scheduled herein. In the event that the dead load deflection of the structure at any isolator location is greater than 0.25 times the scheduled isolator static deflection, the contractor shall increase the static deflection of such isolators to be at least 4.0 times the dead load deflection of the structure.

B. Application Schedule: See also equipment schedule on drawings.

2.8 PIPING AND DUCT RESILIENT SUPPORT AND SUSPENSION



A. Execution Cross-Reference: Refer elsewhere in this Section for the requirements of Resilient Penetrations and Flexible Connections. Refer to Part 3 for the extent of the resilient piping support cited below.

1. At horizontal suspended pipe 2" and smaller connected to vibrating equipment over 2 HP provide Type HS isolator or floor supported Type MSL isolator with a minimum 1.0 inch static deflection. At horizontal suspended piping larger than 2" provide type HD isolator or floor supported Type MSL isolator with a minimum of 1-1/2" static deflection.

2. At vertical riser pipe supports supporting piping attached to vibrating equipment over l/2 hp and piping over 1.0" 0.D., provide Type MS isolators selected for a minimum static deflection of 1.0".

3. At pipe anchors for piping attached to vibrating equipment provide Types MN or HN to avoid direct contact of piping with building.

4. Pipe sway braces where required and attached to vibrating equipment shall utilize neoprene elements of 40 durometer maximum and of 3/8" minimum thickness, Type MN shall be used where such braces are required to accommodate both tension and compression forces.

B. Domestic Water: At horizontal Domestic water piping provide wool felt isolator backed with metal similar to Stoneman Trisolator at each pipe hanger rigging or clamp specified under Division 15 at vertical runs provide by Mason Type N mounts attached to pipe clamps specified under Division 15.

C. High Velocity Ductwork: At ducts with air velocities greater than 1600 FPM provide Type MSL if roof/floor supported, or Type HS if suspended. Penetrations of shaft assemblies by such ductwork shall be non-rigid as described elsewhere in this Section.

D. Vane Axial Fans: At vane axial fans operating against a static of 3" w.g. or greater provide neoprene/spring thrust snubbers, type WBI or WBD by Mason or equal by Sausse.

2.9 FLEXIBLE DUCT CONNECTIONS

A. Fabric: Flexible connection fabric shall be a non-combustible water-proof, airtight, glass fabric, one side coated with Neoprene, weight 20 ounce per square yard. For ducts operating at over 100 degreeF and for acid resistant applications, flexible fabric shall be 30 ounce Neoprene coated glass fabric. All fabric shall meet the



applicable Code of the project jurisdiction. See Section 15880, “Ductwork” for additional material and installation requirements.

B. Acceptable Manufacturers:

1. Vent Fabrics, Inc.

2. Duro-Dyne

3. Advance Elastomeric Systems

4. or equal, as specified elsewhere in this Division.

2.10 FLEXIBLE PIPING CONNECTIONS

A. Application: Provide elastomeric flexible piping connections between piping and vibrating equipment including but not limited to: pumps, cooling towers, air handling units coils and compressors.

1. Provide flexible piping connections to units listed above and similar at all connection points via flexible neoprene connectors consisting of multiple plies of nylon tire cord fabric and neoprene. Neoprene elements shall form at minimum a dual sphere muffler construction at each connection. Connectors up to and including 1-1/2" diameter may have threaded ends. Connectors 2" in diameter or larger shall be manufactured with floating metal flanges recessed to lock the connector's raised face neoprene flanges.

2. Connectors shall be rated to suit system pressure with a minimum of 150 psi at 220 degree F. Flanged equipment shall be directly connected to neoprene elbows in the size range of 2-1/2" to 12" diameter if the piping makes a 90 degree turn at the equipment. All straight through connections shall be made via twin sphere configuration per A above.

3. Provide steel restraint cables with fittings, nuts, steel washer, and acoustical washers where elongation would exceed manufacturer's limits at operating pressure. Elastomeric connectors shall have either tubular or spherical configuration as required or indicated. Spherical type straight connectors shall have two spheres. Elastomeric elbow connectors will not be acceptable.

B. Acceptable subject to above:

1. Safeflex SFDEJ by Mason Industries, Inc.

2. Type 242 by Proco



3. Style 2600 by Amber/Booth Company

4. Merflex Style 5500 TS by Mercer Rubber Company

5. Type VMT by Vibration Mounting & Controls

C. Metallic hoses:

1. Provide subject to paragraph A above only where required by the Architect. Provide two each at every location where A applies above.

2. Provide flexible connectors fabricated of Grade E phosphor bronze, monel or corrugated stainless steel tube covered with comparable bronze or stainless steel braid restraining and pressure cover. Stainless steel grades shall be 304, 3l6, or 32l as required for the application. Live lengths shall be as indicated, but not less than that recommended by the manufacturer for continuous vibration application.

3. Acceptable:

a. Type BBS, SS or BBF by Mason Industries, Inc. b. Type BBS, SS or BBF by Mercer Rubber Company c. Metal-Flex by Amber/Booth Company d. Stainless steel flexible connectors by DME, Inc. e. Type MFP by Vibration Mountings & Controls, Inc.

2.11 RESILIENT PENETRATIONS

A. For piping or ductwork, (Field Fabricated Method):

1. Sleeves: Sleeves of appropriate gage galvanized sheet metal shall be formed to at least the thickness of the penetrated construction and 3/4" to 1" larger in each cross-sectional dimension than the penetrating element.

a. Acceptable:

1) Century-Line Sleeves by Thunderline Corporation 2) Custom by Contractor

2. Batt: Glass fiber of batt or mineral wool, 1 to 3 lb./cu. ft. density.

a. Acceptable Manufacturers

1) Certain-Teed



2) Johns-Manville 3) Owens-Corning

3. Acoustical Sealant:

a. Acceptable Manufacturers:

1) DAP 2) Pecora 3) Tremco 4) U.S. Gypsum

4. Firestop Sealant:

a. Where duct and piping penetrate sound isolation partitions or walls around mechanical rooms, the penetration shall have a maximum clearance of 3/4-inch on all sides and shall be packed with glass fiber and caulked airtight on both sides with acoustically rated sealant, or equal. Acoustic sealant shall be fire rated to meet UL designs for applicable fire rated wall assemblies. For smoke or fire rated partitions see other Sections of this Division.

b. Fully hardened firestop caulk shall develop a Shore A hardness of no greater than 35.

c. Acceptable, subject to approval for intended application by Authorities Having Jurisdiction:

1) G.E. Pensil 100 Firestop Sealant 2) Tremco Fyre-Sil Silicone Fire-stop Construction Sealant

B. For piping penetrations (Factory Fabricated Component Method):

1. A factory-fabricated sleeve assembly with outer sleeve of sheet metal and inner resilient liner of moisture and vermin-resisting felt neoprene, glass fiber or foam rubber 2 to 3/4" thick and bonded to the sheet metal sleeve. Sleeve inside diameter shall be equal to outside diameter of penetrating element. Sleeve length shall be at least equal to the thickness of the penetrated construction. Sleeve shall be set and caulked airtight in penetrated construction and clamped tightly around penetrating element.

2. Acceptable:

a. Mason Type SWS b. Peabody Type PS-1-D



c. Potter-Roemer PR-Isolator d. Stoneman Engineering Trisolator

3. Where required, a fire rated factory fabricated sleeve and inner resilient liner of solid rubber links may be substituted for the preceding when installed in strict accordance with the manufacturer's instructions.

a. Acceptable, subject to by Authorities Having Jurisdiction:

1) Link Seal by ThunderLine Corp.

PART 3 EXECUTION

3.1 INSTALLATION/APPLICATION/PERFORMANCE/ERECTION

A. Seismic Restraint Systems: Maintain equipment, piping, ductwork in a captive position. Do not short circuit vibration systems or transmit objectionable vibration or noise. Structural bases shall be reinforced as required to prevent flexure, misalignment of drive and driven unit or stress transferal into equipment.

B. Vibration Isolation: Mechanical and associated electrical machinery, piping and ductwork shall be mounted on vibration isolators and seismic snubbers as indicated or specified and required to minimize transmission of vibrations and structure borne noise to the building structure or spaces. All mechanical equipment, unless otherwise noted, shall be isolated from the structure by means of resilient vibration and noise isolators.

1. Rotating and reciprocating machinery shall be balanced statically and dynamically.

C. After installation and before equipment start-up an authorized representative of the manufacturer shall visit the site, and shall inspect each isolator and certify in writing that each is installed in accordance with the manufacturer's instructions. Make all adjustments and corrections required by the manufacturer's representative to enable this certification.

D. Ductwork Seismic Restraints:

1. Support and brace all ductwork not otherwise detailed on the Contract Drawings in accordance with NUSIG.

2. Diffuser Bracing: For suspended type ceilings, ceiling mounted air terminals or services shall be positively attached to the ceiling suspension main runners



or to cross runners with the same carrying capacity as the main runners. In addition, two No. 12 gauge slack wires shall be connected from diffusers to the structure above. Connect wire to diffusers at diagonally opposite corners.

3. Support and seismically brace all duct mounted devices including but not limited to VAV/CAV terminal boxes, fan powered boxes, coils, and sound attenuators. Where permitted by the authority having jurisdiction, seismic bracing of duct mounted devices weighing less than 50 lbs may be omitted provided, where appropriate, piping connection to these devices is made with flexible connection. Where bracing for duct mounted devises has been omitted as indicated herein, the weight of devices shall be added to the weight of the ductwork in calculating the required seismic bracing of ductwork.

E. Bases: Equipment shall be set on concrete bases, minimum of 4-inches high.

F. Piping mounted on roof or floor slab: Attach all support points to roof structural member and provide seismic bracing of all piping at an interval of not more than 40 feet.

3.2 FIELD QUALITY CONTROL

A. Testing and Inspection: See DIVISION A.

B. Testing of Concrete Anchors: Anchors drilled into concrete and which are to be loaded in tension (pull-out) will be proof-tested by the Owner to two times the maximum allowable load. 50% of all anchors will be proof-tested. In the event of a single failure, testing of all remaining anchors will be performed as directed by the Architect. Additional testing required because of a test failure shall be paid for by the Contractor.

C. Field Balancing:

1. Dynamic balancing of certain critical rotating equipment is required.

a. Maximum Permissible Machinery Vibration Levels:

1) Mechanical balance of rotating equipment as shown shall be field tested with final drives and couplings in place and with the units in normal operation.

b. Overall vibration amplitude 0.003-inch maximum peak-to-peak, for frequencies below 10 cycles/second (600 rpm) and 0.1-inch/second



maximum peak velocity for frequencies above 10 cycles/second (600 rpm).

c. Take measurements on bearing housings (not end caps) or other heavy structural element directly connected to bearing housing at both ends of each unit.

d. Pulley runout in radial and axial directions shall be less than 0.001-inch.

e. Correct and retest equipment exceeding the limits for compliance.

3.3 INSPECTION OF CONDITIONS

A. Examine related Work and surfaces before starting Work of this Section. Report to the Architect, in writing, conditions which will prevent proper provision of this work. Beginning the Work of this Section without reporting unsuitable conditions to the Architect constitutes acceptance of such conditions by Contractor. Perform any required removal, repair, or replacement of this Work caused by unsuitable conditions at no additional cost to the Owner.

3.4 GENERAL INSTALLATION REQUIREMENTS

A. Stress: Installation or use of vibration isolators must not cause any change of position of equipment or piping which would result in stresses in piping connections or misalignment of shafts or bearings. In order to meet this objective, equipment and piping shall be maintained in a rigid position during installation. The load shall not be transferred to the isolator until the installation is complete and under full operational load.

B. Prior Approval: The Contractor shall not install any equipment, duct or piping which makes rigid contact with the "building" unless it is approved in this specification or by the Architect. "Building" includes, but is not limited to slabs, beams, columns, walls, partitions, ceilings, studs, ceiling framing and suspension systems.

C. Rigid Contact: Prior to installation, bring to the Architect's attention any conflicts between trades which will result in unavoidable rigid contact at equipment or piping or ducts, as described herein, due to inadequate space or other unforeseen conditions. Corrective work necessitated by conflicts after installation shall be at the responsible contractor's expense.

D. Discrepancies: Prior to installation, the Contractor shall bring to the Architect's attention any discrepancies between the specifications and field conditions or changes required due to specific equipment selection. Corrective work necessitated by discrepancies after installation shall be at the Contractor's expense.



E. Protection: Isolators exposed to the outdoors during construction shall either be designed for such exposure or shall be protected by suitable means.

F. Access: The Contractor shall obtain inspection and approval from the Architect of any installation to be covered or enclosed, prior to such closure.

G. Instructions: The Contractor shall obtain written instructions from the vibration isolation manufacturer as to the proper installation and adjustment of vibration isolation devices; alternatively, the equipment may be installed by the vibration isolation manufacturer.

H. Defective Installations: Correct, at no additional cost to the Owner, all installations which are deemed defective in workmanship or materials by the Architect or Consultant.

3.5 EQUIPMENT ISOLATORS

A. Structural Frames: Machine to be isolated shall be supported by a structural steel frame, Type RS, or Type IRSF frames as described herein.

B. Brackets: Brackets shall be provided as required to accommodate the isolator and provide a mechanical stop. The vertical position and size of the bracket shall be submitted by the isolator manufacturer.

C. Clearance: Operating clearance between the bracket and the pad or floor shall be 3/8" 1/16". The minimum operating clearance between the frame and the housekeeping pad or floor shall be 1", for rigid steel and 2" for concrete inertia base.

D. Shims: Frame shall be placed in position and the brackets supported temporarily by 3/8" shims prior to the installation of the machine or isolators.

E. Support: Isolators shall be installed without raising the machine and frame assembly.

F. Adjustment: After the entire system installation is completed and under full operation load, the isolator shall be adjusted so that the load is transferred from the shims to the isolator. When all isolators are properly adjusted, the shims should be barely free and shall be removed. Thereafter, the shims should be used as a gauge to check that the 3/8" clearance is maintained so that the system will remain free of stress.

G. Roof curbs: Installation of Type IRSF shall be in strict conformance with the manufacturer's instructions.



3.6 INSTALLATION REQUIREMENTS, MOTION RESTRAINTS

A. Inspection: All installations shall be inspected and approved by a Civil or Structural Engineer licensed in the Project jurisdiction for adequate motion restraint and to assure that such does not short-circuit vibration isolators during normal operation. Adjustments, as reasonably required, shall be made by the Contractor at no expense to the Owner. Such inspector shall be provided by the Contractor, and the Engineers shall certify the installation in writing.

3.7 PIPING AND DUCT RESILIENT SUPPORT AND SUSPENSION

A. Applies: Pipes included under this Section of the Specifications are refrigeration and hydronic water and all domestic water piping including that connected to vibrating equipment.

B. Does Not Apply: Piping not included is compressed air, piping not listed above, and fire standpipe and sprinkler piping.

C. Extent: Pipes and ducts connected to vibrating equipment shall be resiliently supported or suspended for a distance of 30 feet from such equipment. Refer to Part 2 for products. All connections to such equipment shall include flexible connections specified elsewhere in this Section in minimum lengths conforming to the recommendations in Table 35, Chapter 42, ASHRAE 1991 HVAC Applications.

D. Spring Hangers:

1. Suspension Isolators shall be installed with the isolator hanger box as close as possible to the structure. Such isolators shall be suspended from substantial structural members, not from slab diaphragms unless specifically approved.

2. Hanger rods shall be aligned to clear the hanger box.

E. Domestic Water: Domestic water piping not connected to vibrating equipment shall be resiliently supported by the products listed under Part 2, in accordance with the manufacturer's instructions.

3.8 INSTALLATION REQUIREMENTS, FLEXIBLE DUCT CONNECTIONS

A. Alignment: Align sheet metal duct with fan or fan casing opening in all three dimensions prior to installation of flexible connection, so that duct opening nearly coincides and are almost equally spaced from one another all around. Do not install flexible connection until above requirements are met.



B. Free motion: Fans or fan casings and ducts shall be able to move 1" in any direction relative to each other without short-circuiting metal to metal or stretching taut the flexible connection.

3.9 INSTALLATION REQUIREMENTS, FLEXIBLE PIPING CONNECTIONS

A. Application: Flexible piping connections shall be installed within 10 feet of all vibrating equipment, or prior to penetration of the building, whichever is shorter, on all piping connected to such equipment.

B. Placement: Flexible piping connections shall be located such that their length is at right angles to the principal direction of movement and thus such that the movement of the equipment does not alternately place the connection into tension and compression.

C. Length: Flexible piping connectors shall be installed in accordance with the manufacturer's recommended procedures and in lengths complying with Table 28, Chapter 52, ASHRAE 1995 Applications Handbook.

D. Braided metal hose: Where permitted as a substitution, shall be installed in pairs, one in the vertical plane and one in the horizontal plane at each location that a single flexible pipe is required in this section.

3.10 INSTALLATION REQUIREMENTS, RESILIENT PENETRATIONS

A. Application: Penetrations included in this Section of the Specifications include all piping and ducts connected to vibrating equipment within 30 feet of such equipment.

B. Alternate A for round or rectangular penetrations:

1. Cut a clean opening in the penetrated construction very nearly the size of the sleeve for each penetrating element. Provide lintels above, relief structure below and vertical framing between and to the sides, as required. Provide the above, escutcheon plates and such related construction as is necessary to make the penetrated structure as solid and massive near the penetrations as the surrounding construction.

2. Set the metal sleeve into the penetrated construction in an airtight manner around its outer periphery, using grout, dry packing, plaster or drywall compound full depth and all around - but only to a maximum width of 2" - or the requirements of the above paragraph shall not have been satisfied.



3. Pack annular opening with glass fiber between metal sleeve and penetrating element full depth, all around to a firm degree of compaction. Leave a 2" deep annular opening free at each end of the metal sleeve; fill this fully with sealant.

C. Alternate B for round penetrations: Observe requirements above, except that use of sealant at sleeve ends is not required. In lieu of sealant, clamp factory-fabricated sleeve assemblies specified in Part 2 tightly around penetrating elements, using built-in or field-supplied clamping devices. Apply clamping of sleeves to penetrating services before sealing of sleeves to penetrated constructions. Refer to manufacturer's instructions for installation of fire-rated rubber link systems.

3.11 EQUIPMENT ROOM/PLENUM REQUIREMENTS

A. Airtight Enclosure: All mechanical rooms, plenums, duct shafts and drywall duct enclosures shall be constructed airtight. This means that every precaution shall be taken to maintain construction completely airtight around a room so designated. Construction joints, duct penetrations, electrical boxes, frames, supports, cabinets, doors, access panels, fixtures, etc., all shall be built or installed in such a manner as to prevent sound transmission through any construction enclosing a room horizontally or vertically. Appropriate lintels, frames, blocking, escutcheons, grouting, gaskets, packing, caulking, taping, filling, etc., all shall be employed to prevent sound transmission. Refer to requirements of this Section for Resilient Penetrations.

B. Discrepancies: All work under this section is to comply with the above. Report to architect any construction conditions which arise which might compromise compliance with this requirement.

3.12 REQUIRED HVAC AMBIENT NOISE CRITERION

A. Criteria: The ambient noise levels resulting from HVAC equipment shall not exceed the noise criterion (NC levels) scheduled below.

B. Contract Documents: The noise criterion scheduled herein have been utilized to determine the sizing of the sound traps and amount of acoustical lining of ductwork required to meet this criteria.

C. Field Design: Where field alterations are made to the design, main duct and branch duct velocities shall be sufficient to provide noise attenuation to the noise criteria NC-30.

END OF SECTION